Insulator



Aug. 20, 19.46. M. D. MATHEWS 2,406,095

INSULATOR Filed Sept. 27, 1944 [W EN TOR.

Patented Aug. 20, 1946 UNITED STATES PATENT OFFICE INSULATOR Martin D. Mathews, Indianapolis, Ind.

Application September 27, 1944, Serial No. 556,017

1 Claim. 1

This invention relates to insulators, the primary object being to provide insulators each of which is formed in a single piece of insulating material, such as porcelain or the like, and which are so constructed that when twist wires leading from a cable to the main wires are inserted thereinto, a portion of each twist or duplex wire will be supported at a high point so as to maintain a dry spot and preventing a wet weather cross or a high resistance short between the main wires such as frequently occurs during stormy weather where ordinary types of insulators are employed.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel steps in the method and certain details of construction and combinations of parts hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the method disclosed and in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

In the accompanying drawing the preferred form of the invention has been shown.

In said drawing:

Figure 1 is a side elevation of the insulator engaged by a main wire and a duplex wire leading oiT from the main wire.

Figure 2 is a view partly in elevation and partly in section taken on the line 22, Figure 1.

Figure 3 is a section on line 3-3, Figure 2.

Referring to the figures by characters of reference, I designates the body of the insulator which can be made of porcelain, glass, or any other suitable material and is provided with the usual annular bead 2 from which is extended a concentric neck 3 which, in the present instance, is formed with an integral cap 4 the marginal portion 5 of which is extended outwardly beyond the neck.

Extending upwardly into the cap from the neck is a slot 6, the center portion of which opens outwardly under the margin of the cap as shown at 1 while the central or uppermost portion of the slot is located within the cap at a point well above the level of the margin 5 and provides a recess or seat 8. The slot is not only curved upwardly and inwardly from the point 1 to the seat 8, but it is also curved downwardly from the center toward each of its ends, thereby extending over and partly around an internal node 9 integral with and contained within the cap. The ends of the slot, which has been indicated at ID, are joined to the seat 8 by upwardly inclined curved grooves ll forming continuations or extensions of the central seat 8.

In practice the main wire or wires M are fastened to the neck portion 3 of the insulator in the usual way. The duplex or other wire to be joined to the main wire M and which has been indicated as W is fastened in the usual way to the main wire M. It is then crimped at a point between its ends, as indicated at C, to form a bow and this bow is slipped upwardly within the inclined curved slot 6 until the intermediate portion of the bow rests in the seat 8 while the diverging portions of the bow lie within the downwardly diverging curved grooves l I. As these bows open downwardly under the margin 5 of the cap, at points much lower than the level of the seat 8, it will be obvious that a dry spot will be maintained at seat 8 with the result that a wet weath er cross or a high resistance short between the wires will be avoided.

What is claimed is:

An insulator for preventing the drainage of moisture from a main wire to a duplex wire joined thereto, said insulator comprising a single piece of insulating material providing a body, a neck on the body, and a cap on and having a marginal portion extending outwardly beyond the neck, said neck and cap defining an annular groove for the reception of a portion of a main wire and of a tie wire joined to the main wire, and a node in the cap defined by an arcuate slot opening outwardly under the marginal portion of the cap and into the groove, said slot being curved upwardly and inwardly within the cap, the top of the node constituting an elevated seat for the arched portion of a duplex wire when extending within the groove and upwardly within the slot in the cap.

MARTIN D. MATHEWS. 

